BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      11-09-2013, 11:25 PM   #1
sparkyblue
Captain
 
sparkyblue's Avatar
 
Drives: E82 135i
Join Date: Jan 2011
Location: Fremont, California

Posts: 646
iTrader: (4)

Garage List
2008 BMW 135i  [0.00]
Tire fitment Front 235/40/18 MPSS on ET45 8.5" Wheels

Anyone run 235/40/18 with MPSS on ET45 & 8.5" 18" Wheels up front?

I am lowered too on KW V1's.

My front 225/40/18 MPSS are nearly done, and with the rain season coming its time to replace them. I want to get as much front grip as possible so I am considering 235/40/18's.

Anyone run 235/40/18 MPSS on ET45 8.5in 18" wheels? I have the VMR V718's if anyone's curious.



sparkyblue is offline   United_States
0
Reply With Quote
      11-10-2013, 08:24 AM   #2
Stohlen
Major
 
Drives: AW 135i
Join Date: Aug 2012
Location: Waterford, Mi

Posts: 1,228
iTrader: (2)

Garage List
2008 BMW 135i  [2.83]
You may run into problems with a 40 series up front when you're lowered. You'd probably be fine with a 35 series tho.

For comparison on a stock height car I had to do a ton of work to get 245/40s to fit. Trimming, camber, fender rolling/pulling, etc.
__________________
Build thread: http://www.1addicts.com/forums/showthread.php?t=748935


I will never buy from Forgestar or EAS again after my nightmare wheel purchase.
Stohlen is offline  
0
Reply With Quote
      11-10-2013, 10:54 AM   #3
HeelToe
Major
 
HeelToe's Avatar
 
Drives: Rapidly from A to B
Join Date: Jun 2005
Location: Illinois

Posts: 1,090
iTrader: (2)

Garage List
2014 X1 2.8i xDrive  [0.00]
2000 323Ci  [3.00]
2006 330i  [4.50]
2013 BMW 135is  [4.50]
I am currently running 235/40-18 MPSS on 8.5-18-45 Forgestar CF5. No rubbing - zero. Very cozy fit though on the strut side to be sure. I have BMWP springs which lower the car by about 0.5 inches. I also have Dinan camber plates which raise the car by about 0.25. So net lower is about 0.25. Negative 1.5 camber is dialed in. I'd feel confident that with your setup you can make it work.

I have 245/35 on the back with the same wheels. I tried them on the front for fun and they will need a 3 mm spacer to work with no rub on the strut side.

Hope this helps.
Attached Images
  

Last edited by HeelToe; 11-10-2013 at 11:02 AM.
HeelToe is offline   United_States
0
Reply With Quote
      11-10-2013, 01:22 PM   #4
3002 tii
Major General
 
3002 tii's Avatar
 
Drives: flat out
Join Date: Apr 2008
Location: NNJ

Posts: 8,164
iTrader: (44)

Garage List
Quote:
Originally Posted by HeelToe View Post
I am currently running 235/40-18 MPSS on 8.5-18-45 Forgestar CF5. No rubbing - zero. Very cozy fit though on the strut side to be sure. I have BMWP springs which lower the car by about 0.5 inches. I also have Dinan camber plates which raise the car by about 0.25. So net lower is about 0.25. Negative 1.5 camber is dialed in. I'd feel confident that with your setup you can make it work.

I have 245/35 on the back with the same wheels. I tried them on the front for fun and they will need a 3 mm spacer to work with no rub on the strut side.

Hope this helps.
You're 235/40 front 245/35 rear?

On a separate note why is it that so many folks here don't understand basic tire sizing? They only bother to look at width not realizing how profile changes height.

OP I would much rather run 245/35 square with a 2-3mm spacer up front than rim a 235/40 which is 0.6" taller than stock. That alone would be enough to cause running due to being too tall. 245 gives you benefit of more traction up front while maintaining stock height. If I were to upsize, I wouldn't go more than 225/40 which is 1/3" more. It'll provide a more comfortable ride, fill out wheel gap and work well with factory wheel widths. But seeing how you got 8.5" et45, go 245/35 and pick up a spacer from Apex (free s&h).
__________________

Recaro | Volk | AST | Vorshlag | Quaife | Stoptech | Active Autowerke | BMW Performance

Click here for my track videos
3002 tii is offline   United_States
0
Reply With Quote
      11-10-2013, 02:02 PM   #5
HeelToe
Major
 
HeelToe's Avatar
 
Drives: Rapidly from A to B
Join Date: Jun 2005
Location: Illinois

Posts: 1,090
iTrader: (2)

Garage List
2014 X1 2.8i xDrive  [0.00]
2000 323Ci  [3.00]
2006 330i  [4.50]
2013 BMW 135is  [4.50]
Quote:
Originally Posted by 3002 Tii View Post
You're 235/40 front 245/35 rear?

On a separate note why is it that so many folks here don't understand basic tire sizing? They only bother to look at width not realizing how profile changes height.

OP I would much rather run 245/35 square with a 2-3mm spacer up front than rim a 235/40 which is 0.6" taller than stock. That alone would be enough to cause running due to being too tall. 245 gives you benefit of more traction up front while maintaining stock height. If I were to upsize, I wouldn't go more than 225/40 which is 1/3" more. It'll provide a more comfortable ride, fill out wheel gap and work well with factory wheel widths. But seeing how you got 8.5" et45, go 245/35 and pick up a spacer from Apex (free s&h).
Yep. 235/40 and 245/35. No rubbing despite what you might think. Also, I'm fully aware of the height difference and bought it intentionally so I wouldn't assume that people don't understand it though in some cases I'm sure you're right. Roads in Chicago can be tough and some extra radius is ok in my book. BTW diameter is increased by about 0.6 but the radius (ride height) is increased by 0.3.
HeelToe is offline   United_States
0
Reply With Quote
      11-10-2013, 02:06 PM   #6
3002 tii
Major General
 
3002 tii's Avatar
 
Drives: flat out
Join Date: Apr 2008
Location: NNJ

Posts: 8,164
iTrader: (44)

Garage List
Quote:
Originally Posted by HeelToe View Post
Yep. 235/40 and 245/35. No rubbing despite what you might think. Also, I'm fully aware of the height difference and bought it intentionally so I wouldn't assume that people don't understand it though in some cases I'm sure you're right. Roads in Chicago can be tough and some extra radius is ok in my book. BTW diameter is increased by about 0.6 but the radius (ride height) is increased by 0.3.
Yea but why run mismatched heights front and rear? Why not run the same increased height both front and rear?

I'm not surprised you don't run since your drop is so minimal but I'm pretty sure OP will be running his KW's lower.

Oh yea Chicago roads can't be much worse than NJ/NYC
__________________

Recaro | Volk | AST | Vorshlag | Quaife | Stoptech | Active Autowerke | BMW Performance

Click here for my track videos
3002 tii is offline   United_States
0
Reply With Quote
      11-10-2013, 02:13 PM   #7
Stohlen
Major
 
Drives: AW 135i
Join Date: Aug 2012
Location: Waterford, Mi

Posts: 1,228
iTrader: (2)

Garage List
2008 BMW 135i  [2.83]
Quote:
Originally Posted by 3002 Tii View Post
Yea but why run mismatched heights front and rear? Why not run the same increased height both front and rear?

I'm not surprised you don't run since your drop is so minimal but I'm pretty sure OP will be running his KW's lower.

Oh yea Chicago roads can't be much worse than NJ/NYC
Tire selection? I couldn't get the type of tires I wanted in 245/35 to match the 285/30s, so I had to get 245/40s.
__________________
Build thread: http://www.1addicts.com/forums/showthread.php?t=748935


I will never buy from Forgestar or EAS again after my nightmare wheel purchase.
Stohlen is offline  
0
Reply With Quote
      11-10-2013, 02:34 PM   #8
HeelToe
Major
 
HeelToe's Avatar
 
Drives: Rapidly from A to B
Join Date: Jun 2005
Location: Illinois

Posts: 1,090
iTrader: (2)

Garage List
2014 X1 2.8i xDrive  [0.00]
2000 323Ci  [3.00]
2006 330i  [4.50]
2013 BMW 135is  [4.50]
Quote:
Originally Posted by 3002 Tii View Post
Yea but why run mismatched heights front and rear? Why not run the same increased height both front and rear?

I'm not surprised you don't run since your drop is so minimal but I'm pretty sure OP will be running his KW's lower.

Oh yea Chicago roads can't be much worse than NJ/NYC
Long story on the sizes but here are a few items that were considered:
  • 1s dont have a lot of space in front to work with.
  • Wanted square wheels and a close to square setup. Forgestars had what I wanted so 8.5-45 was the target size.
  • Wasn't sure if 255/35 rear on et45 would fit. Wasn't sure if 245/35 would fit in front. Knew that 245/35 would fit in the rear.
  • Differential in diameter not important to me since max difference with a 245 rear was relatively small.
  • Want to make sure that the tire overhangs the wheel so I get some curb rash protection.
  • Wanted maximum width possible without fender roll.
  • Tire size options also came into play.
  • Didn't want to risk getting something that wouldn't fit.

I don't recall but there may have been other things I considered at the time. Clearly thought it through. The car, wheel, suspension, and tires were all new to me. So I went with something safe. Once these tires are spent I will go with either 245/35 & 255/35 or 235/40 and 245/35.
HeelToe is offline   United_States
0
Reply With Quote
      11-10-2013, 02:44 PM   #9
3002 tii
Major General
 
3002 tii's Avatar
 
Drives: flat out
Join Date: Apr 2008
Location: NNJ

Posts: 8,164
iTrader: (44)

Garage List
Quote:
Originally Posted by HeelToe View Post
Long story on the sizes but here are a few items that were considered:
  • 1s dont have a lot of space in front to work with.
  • Wanted square wheels and a close to square setup. Forgestars had what I wanted so 8.5-45 was the target size.
  • Wasn't sure if 255/35 rear on et45 would fit. Wasn't sure if 245/35 would fit. Knew that 245/35 would fit in the rear.
  • Differential in diameter not important to me since max difference with a 245 rear was relatively small.
  • Want to make sure that the tire overhangs the wheel so I get some curb rash protection.
  • Wanted maximum width possible without fender roll.
  • Tire size options also came into play.
  • Didn't want to risk getting something that wouldn't fit.

I don't recall but there may have been other things I considered at the time. Clearly thought it through. The car, wheel, suspension, and tires were all new to me. So I went with something safe. Once these tires are spent I will go with either 245/35 & 255/35 or 235/40 and 245/35.
Good answer!

FWIW a 245/35 should fit with 3mm spacer and fixed camber plates
__________________

Recaro | Volk | AST | Vorshlag | Quaife | Stoptech | Active Autowerke | BMW Performance

Click here for my track videos
3002 tii is offline   United_States
0
Reply With Quote
      11-10-2013, 03:09 PM   #10
Stohlen
Major
 
Drives: AW 135i
Join Date: Aug 2012
Location: Waterford, Mi

Posts: 1,228
iTrader: (2)

Garage List
2008 BMW 135i  [2.83]
Quote:
Originally Posted by 3002 Tii View Post
Good answer!

FWIW a 245/35 should fit with 3mm spacer and fixed camber plates
Dont even need a spacer with certain tire brands.
__________________
Build thread: http://www.1addicts.com/forums/showthread.php?t=748935


I will never buy from Forgestar or EAS again after my nightmare wheel purchase.
Stohlen is offline  
0
Reply With Quote
      11-10-2013, 03:14 PM   #11
3002 tii
Major General
 
3002 tii's Avatar
 
Drives: flat out
Join Date: Apr 2008
Location: NNJ

Posts: 8,164
iTrader: (44)

Garage List
Quote:
Originally Posted by Stohlen View Post
Dont even need a spacer with certain tire brands.
True but if someone is trying to stuff 245 up front chances are its a performance tire with wide shoulders
__________________

Recaro | Volk | AST | Vorshlag | Quaife | Stoptech | Active Autowerke | BMW Performance

Click here for my track videos
3002 tii is offline   United_States
0
Reply With Quote
      11-10-2013, 03:47 PM   #12
Stohlen
Major
 
Drives: AW 135i
Join Date: Aug 2012
Location: Waterford, Mi

Posts: 1,228
iTrader: (2)

Garage List
2008 BMW 135i  [2.83]
Quote:
Originally Posted by 3002 Tii View Post
True but if someone is trying to stuff 245 up front chances are its a performance tire with wide shoulders
Just saying direzza's and nitto nt05s dont.
__________________
Build thread: http://www.1addicts.com/forums/showthread.php?t=748935


I will never buy from Forgestar or EAS again after my nightmare wheel purchase.
Stohlen is offline  
0
Reply With Quote
      11-10-2013, 04:06 PM   #13
HeelToe
Major
 
HeelToe's Avatar
 
Drives: Rapidly from A to B
Join Date: Jun 2005
Location: Illinois

Posts: 1,090
iTrader: (2)

Garage List
2014 X1 2.8i xDrive  [0.00]
2000 323Ci  [3.00]
2006 330i  [4.50]
2013 BMW 135is  [4.50]
I tested the MPSS from the rear 245/35s on the front for grins. They will require a spacer. 3mm will do the trick for sure. Like I said, once these tires are spent I'll seriously consider 245/35 up front with the spacer. Really want to put RE11s on but they don't come in 245/35. BTW I have Dinan fixed plates and my current camber is dialed in at -1.5.

Last edited by HeelToe; 11-10-2013 at 04:23 PM.
HeelToe is offline   United_States
0
Reply With Quote
      11-10-2013, 04:33 PM   #14
3002 tii
Major General
 
3002 tii's Avatar
 
Drives: flat out
Join Date: Apr 2008
Location: NNJ

Posts: 8,164
iTrader: (44)

Garage List
Quote:
Originally Posted by Stohlen View Post
Just saying direzza's and nitto nt05s dont.
I wasn't be even aware SS came out in a 245/35-18
__________________

Recaro | Volk | AST | Vorshlag | Quaife | Stoptech | Active Autowerke | BMW Performance

Click here for my track videos
3002 tii is offline   United_States
0
Reply With Quote
      11-10-2013, 04:36 PM   #15
3002 tii
Major General
 
3002 tii's Avatar
 
Drives: flat out
Join Date: Apr 2008
Location: NNJ

Posts: 8,164
iTrader: (44)

Garage List
Quote:
Originally Posted by HeelToe View Post
I tested the MPSS from the rear 245/35s on the front for grins. They will require a spacer. 3mm will do the trick for sure. Like I said, once these tires are spent I'll seriously consider 245/35 up front with the spacer. Really want to put RE11s on but they don't come in 245/35. BTW I have Dinan fixed plates and my current camber is dialed in at -1.5.
Interesting enough I have the perfect set of track wheels (18x8.5 et42) that would work great on this car with a 245/35-18 but I'm not sure if I want to track this car. Right now those wheels have 255/35's and I use them as my wet setup on the Z but part of me is really curious to see his this car would perform with 245 square, Carbotech pads and Dinan camber plates (the bare minimum I'd invest on track mods), all else stock.
__________________

Recaro | Volk | AST | Vorshlag | Quaife | Stoptech | Active Autowerke | BMW Performance

Click here for my track videos
3002 tii is offline   United_States
0
Reply With Quote
      11-10-2013, 06:27 PM   #16
HeelToe
Major
 
HeelToe's Avatar
 
Drives: Rapidly from A to B
Join Date: Jun 2005
Location: Illinois

Posts: 1,090
iTrader: (2)

Garage List
2014 X1 2.8i xDrive  [0.00]
2000 323Ci  [3.00]
2006 330i  [4.50]
2013 BMW 135is  [4.50]
Quote:
Originally Posted by 3002 Tii View Post
...I'm not sure if I want to track this car...
Do it!
HeelToe is offline   United_States
0
Reply With Quote
      11-11-2013, 05:35 AM   #17
sparkyblue
Captain
 
sparkyblue's Avatar
 
Drives: E82 135i
Join Date: Jan 2011
Location: Fremont, California

Posts: 646
iTrader: (4)

Garage List
2008 BMW 135i  [0.00]
Quote:
Originally Posted by Stohlen View Post
You may run into problems with a 40 series up front when you're lowered. You'd probably be fine with a 35 series tho.

For comparison on a stock height car I had to do a ton of work to get 245/40s to fit. Trimming, camber, fender rolling/pulling, etc.
Thanks for your feedback.

Quote:
Originally Posted by HeelToe View Post
I am currently running 235/40-18 MPSS on 8.5-18-45 Forgestar CF5. No rubbing - zero. Very cozy fit though on the strut side to be sure. I have BMWP springs which lower the car by about 0.5 inches. I also have Dinan camber plates which raise the car by about 0.25. So net lower is about 0.25. Negative 1.5 camber is dialed in. I'd feel confident that with your setup you can make it work.

I have 245/35 on the back with the same wheels. I tried them on the front for fun and they will need a 3 mm spacer to work with no rub on the strut side.

Hope this helps.
Thanks for the feedback.

I am very much consdering 235/40's now. However, I do see that you have -1.5 camber in the front which helps with fender clearance. I don't have camber plates, and I had my alignment shop knock out the pins to get -0.9 camber up front I believe.

My car also is dropped much more than your suspension. It may be hard to tell in the photos I have posted.

Quote:
Originally Posted by 3002 Tii View Post
You're 235/40 front 245/35 rear?

On a separate note why is it that so many folks here don't understand basic tire sizing? They only bother to look at width not realizing how profile changes height.

OP I would much rather run 245/35 square with a 2-3mm spacer up front than rim a 235/40 which is 0.6" taller than stock. That alone would be enough to cause running due to being too tall. 245 gives you benefit of more traction up front while maintaining stock height. If I were to upsize, I wouldn't go more than 225/40 which is 1/3" more. It'll provide a more comfortable ride, fill out wheel gap and work well with factory wheel widths. But seeing how you got 8.5" et45, go 245/35 and pick up a spacer from Apex (free s&h).
I do realize that increasing width also causes the profile to increase in height. But I did not realize a jump from 225/40 -> 235/40 would be that significant (0.6"+ as you said?). Definitely something to consider now too then, as I really do not want to have to deal with any rubbing issues. I want my wheels/tires to fit right, the first time without having to do the run around and trial and error. That's what all you awesome forum members are for! :]

I would like to run a larger width up front. However I am a bit afraid of changing the cars handling characteristics too much if I go 245/35 square. I do want a bit more front end grip which is why I am considering up-sizing the front tires from what I have now (225/40->235/40).

As of now, when I push the car into the canyons as hard and aggressively as I possibly can. With the F:225 & R:255 MPSS, no matter how aggressive I turn or carve in the canyons, the rears will NEVER break loose or slip (into an oversteer) and I will always get into an understeer situation first.

I do realize, that does sound a bit weird. But having this car for 2+ years now, and being used to its handling characteristics at the limit, I do not want to modify it very much as I am afraid of crashing in a stone wall or worse off a cliff.

However, I would like to reduce the understeer a little bit, with hopes by going wider from 225->235.

Added note, as I said above. I do not have camber plates, therefore my Front camber is -0.9 degrees (my alignment shop knocked the pins out). So going 245's will also not be possible without fender rubbing I believe, especially so with a 3mm spacer, pushing the wheels&tires out further towards my fender.
Edit:: My KW V1's has the car lowered pretty significantly (as pictured in the first post). I have to take that into account as well.

I just checked tirerack as well, and they don't offer a 235/35/18 in MPSS. -doh!-
sparkyblue is offline   United_States
0
Reply With Quote
      11-11-2013, 08:27 AM   #18
Stohlen
Major
 
Drives: AW 135i
Join Date: Aug 2012
Location: Waterford, Mi

Posts: 1,228
iTrader: (2)

Garage List
2008 BMW 135i  [2.83]
Quote:
Originally Posted by sparkyblue View Post
I do realize that increasing width also causes the profile to increase in height. But I did not realize a jump from 225/40 -> 235/40 would be that significant (0.6"+ as you said?).
Its not. The difference is 4mm which is about 0.15".
__________________
Build thread: http://www.1addicts.com/forums/showthread.php?t=748935


I will never buy from Forgestar or EAS again after my nightmare wheel purchase.
Stohlen is offline  
0
Reply With Quote
      11-26-2013, 10:18 PM   #19
pj.rodriguez
Major
 
pj.rodriguez's Avatar
 
Drives: Alpine White 128i Cabrio
Join Date: Jun 2013
Location: Toronto, Ontario, Canada

Posts: 1,210
iTrader: (6)

Garage List
If I were to get a set of rims that are squared at 17x8.5 +40 would I need a 5 mm spacer for the fronts? I too would like to try a square 235 setup rather than the stock 128 sport sizes of 215/40/18 and 245/35/18 (I think).
pj.rodriguez is offline   Canada
0
Reply With Quote
      11-26-2013, 11:50 PM   #20
HeelToe
Major
 
HeelToe's Avatar
 
Drives: Rapidly from A to B
Join Date: Jun 2005
Location: Illinois

Posts: 1,090
iTrader: (2)

Garage List
2014 X1 2.8i xDrive  [0.00]
2000 323Ci  [3.00]
2006 330i  [4.50]
2013 BMW 135is  [4.50]
Quote:
Originally Posted by pj.rodriguez View Post
If I were to get a set of rims that are squared at 17x8.5 +40 would I need a 5 mm spacer for the fronts? I too would like to try a square 235 setup rather than the stock 128 sport sizes of 215/40/18 and 245/35/18 (I think).
No spacer required. A 5mm spacer on a 40 offset gives you a 35 offset which is actually getting pretty aggressive and could cause you rubbing in the fender. You are better off with no spacer when running a 40 offset wheel up front and will definitely not have any rubbing on the strut side.
HeelToe is offline   United_States
0
Reply With Quote
      11-27-2013, 08:37 AM   #21
pj.rodriguez
Major
 
pj.rodriguez's Avatar
 
Drives: Alpine White 128i Cabrio
Join Date: Jun 2013
Location: Toronto, Ontario, Canada

Posts: 1,210
iTrader: (6)

Garage List
Quote:
Originally Posted by HeelToe View Post
No spacer required. A 5mm spacer on a 40 offset gives you a 35 offset which is actually getting pretty aggressive and could cause you rubbing in the fender. You are better off with no spacer when running a 40 offset wheel up front and will definitely not have any rubbing on the strut side.
Oh right. I was thinking the opposite way. Whoops. Sorry! So the 40 would already be pretty aggressive then? Hm. May have to rethink. Do you think I could run square 235 or would that rub the fender?
pj.rodriguez is offline   Canada
0
Reply With Quote
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 05:28 AM.




1addicts
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST